Andrew Gabriel wrote:
In article
,
robgraham writes:
Why is that when you are at one's intellectual worst that the more
complex of discussions occur - solution of the world's problems,
etc !!!

This particular one revolved round ac and dc motors - covering single
phase v. 3 ph induction motors and their relative power /torque
capabilities and how they work, which was hard work 45 years after
university, but what triggered the whole discussion was how Bosch can
claim that a lawnmower with a 36v Li-polymer powered dc motor can
have the same capability as a 1700w ac motor. OK 1700w is a
comfortable 2hp but single phase induction motors are not too good
on torque, and if I remember that is where dc motors score but are
modern ones going to match a 1700w ac motor ?

I think most electric mowers are universal motors (i.e. with
brushes and a commutator). SNIP

Cetrainly all the 'hovver' mowers would be, an induction motor would be far
to heavy.

Cost is also a factor, all the el cheapo pressure washers have universal
motors because of the cost, commercial machines have induction.


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk